Desk lid support.



normal position after the stop-pawl has removed the locking-pawl carried by the piston, substantially as described.

5. The combination of an eccentric, an eccentric-rod, a suitable rocking arm to which said eccentric-rod is pivoted, a sliding rod with which the free end of the eccentric-rod engages and moves at one revolution of the eccentric, a pawl adapted to drop into position to lock the piston in the rocking arm extended at the end of the first revolution, and a stop-pawl adapted to remove from locking position said pawl first mentioned at the end of the second revolution, substantially as described.

6. The combination of an eccentric, an eccentric-rod having a free end, a suitable extensible rocking arm to which the said eccentric-rod is pivoted, a sliding shaft adapted to engage with the free end of the eccentric-rod, forming a temporary fulcrum by means of which the further revolution of the eccentric extends the rocking arm, substantially as described.

7. The combination of an eccentric, an cecentric-rod having a free end, a suitable automatically-extensible rocking arm to which the eccentric-rod is pivoted, a sliding shaft operated by the eccentric-rod adapted to form a fulcrum whereby the rocking arm is partially extended by one revolution of the eccentric-shaft, and by the second contact, during the next revolution, is extended fully, substantially as described.

8. The combination with the eccentric, an eccentric-rod pivoted to a suitable rocking arm, a sliding shaft moved by contact with the eccentric-rod and forming a fulcrum for extending the extensible rocking arm, a pawl adapted to fall into locking position and retain said rocking arm extended, and a pawl acting as a stop adapted to remove said locking-pawl from its locking position and to allow the swinging arm to return to normal position, substantially as described.

9. The combination of an eccentric and an eccentric-rod, a rocking arm, a piston in said rocking arm pivotally connected to the eccentric-rod, a sliding shaft adapted to engage with the free end of the eccentric-rod at one revolution and partially extend the said piston at one revolution, and to engage with the free end of the said eccentric-rod and complete its extension by the second revolution, substantially as described.

10. The combination of an eccentric, an cecentric-rod, an extensible rocking arm, a sliding rod operated by contact with the free end of the eccentric and serving as a fulcrum at one revolution of the eccentric, a pawl adapted to lock the arm in its partially-extended position, the second contact between the free end of the eccentric-rod and the sliding shaft also adapted to further extend the rocking arm, and a stop-pawl adapted at every alternate revolution of the eccentric to release the locking-pawl from position and to allow the piston in the extensible arm to return to normal position, substantially as described.

11. In combination with a gas or vapor engine, the combination of an eccentric, an eccentric-rod, an extensible arm to which said eccentric-rod is pivoted, a sliding shaft adapted to engage with the free end of the eccentric-rod, and suitable mechanism for extendin g the rocking arm at every other revolution of the eccentric, substantially as described.

12. The combination of an eccentric and eccentric rod, an automatically extensible rockingv arm pivoted thereto, and suitable means for presenting the free end of the eccentric rod in different positions at every other revolution of the eccentric,substantially as described.

18. In combination with an eccentric and eccentric-rod, said eccentric-rod having a free end, an automatically-extensible rocking arm to which said eccentricrod is pivoted, a sliding shaft adapted to contact with the free end of the eccentric at one point during one revolution and at a different point at the next revolution.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

HARRY J. PERKINS.

\Vitnesses EDWARD TAGGART, CHRISTOPHER HONDELINK.

Patented Aug. 8, I899. E. F. 8. F. D. POOLEY.

E. F. POOLEY 8:. H. S. WADSWORTl-l, Exacutors of F. D. PUULEY, Dec'd.

DESK LID SUPPORT.

(Application filed Jan, 4, 1898.)

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UNITED STATES PATENT OFFICE,

EDWARD F. POOLEY; OF PHILADELPHIA, PENNSYLVANIA; EDWVARD F. POOLEY AND HARRY S. WADSWQR'lI-I, OF SAME PLACE, EXECUTORS OF FRANK D. POOLEY, DECEASED DESK-LID PPO RT.

SPECIFICATION formingpart of'Letters Patent no. 630,739, dated August 8,1899.

Original application filed April 28, 1893, Serial No. 472,202. .Divided and this application filed January 4, 1898. Serial No.

. 665,531. (No model.)

T aZZ whom it may concern:

Be it known that EDWARD F. POOLEY and EDWARD F. PooLEY and HARRY S. WADs- WORTH, administrators of the estate of FRANK D. POOLEY, deceased, citizens of the United States, residing atPhiladelphia, in the county of Philadelphia and State of Pennsylvania, invented certain new and useful Improvements in Desk-Lid Supports; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in desks, and more particularly toim provements in lid-supporting devices for drop-lid desks and the like, and this application is a division of the application filed by us April 28, 1893,

Serial N0. 472,202.

The objects and nature of the invention will more fully appear-hereinafter, although in the drawings we show one example of a construction which embodies our invention, which invention consists in certain novel features in construction and in arrangements and in combinations of parts, as more fully and particularly pointed out and described hereinafter.

Referring to the accompanying drawings,

Figure 1 shows part of a drop-lid desk with the lid lowered and the lid-supports thrown out. Dotted lines show thehidden supportoperating mechanism actuated by the lid through the medium of the flush link. Fig. 2-

is a part of the desk withan end removed to illustrate a form of support-operating mech anism. Fig. 3 is a cross-sectional view through the support desk shelf, end, and link, showing the lever in edge elevation, a portion only of the desk being shown, the sect-ion being taken 0 on line 3 3, Fig. 2.

Inthe drawings, a is the desk shelf or top,-

and b b the ends ofan ordinary drop-lid desk having a vertically-swinging lid 0, suitably hinged to swing from the closed upright position against the front edges of the ends to the lowered approximately horizontal position.v

(Shown in'Fig. 1 of the drawings.) This lid is usually suitablyhinged at its inner edge to the front edge of the desk-shelf, so that when the lid is lowered it forms and constitutes an outward continuation of the desk-shelf.

The desk-shelf at its endsis rigidly secured to the desk ends, and the shelf has the slots at a extending completely therethrough adj acent the respective desk ends. These slots 5 5 a extend vertically through the shelf and are elongated transversely thereof and are preferabl y formed very narrow, so thatthe appearance of the desk-shelf is in no way marred and to avoid weakening thereof. Grooves, 6o sockets,or depressed seats a extend forwardly from the front ends of said slots, respectively,

to and through the front edge of the deskshelf, and the opposite ends of the lids have depressed seats or sockets c, which are in continuation of said seats a respectively. Said seats a a are preferably formed narrow to avoid weakening or marring the appearance of the parts. (1 d are supports or slides moving-in and out beneath the ends of the desk shelf and lid. These slides are preferably formed flat and comparatively narrow or thin in width and are arranged on edge, with their lower edges slidin gin suitable ways,a distance below the desk-shelf, with their upper edges sliding in contact with the under face of the desk-shelf. The flat faces of the slide are ad jacent and parallel with the flat inner faces of the respective desk ends. The slides move through narrow vertical openings in the deskfront beneath the vertically-swinging lid and the front edge of the desk-shelf.

Loose pivotal actuating connections are provided between the lid and two lid-supporting slides. Said connections are arranged not to proj ect'above the surface of the lid and shelf and to be partially in visible and beneath the desk-shelf. To illustrate an example of our invention, we refer to the drawings, wherein each slide is operated by a link e, preferably, although not necessarily, cut from sheet metal and formed comparatively narrow in width. The outer end of the link is pivotally joined to the desk-lid, as at e, and the link from thence 9 5 extends over the lid (when lowered) and the desk-shelf to the sl0t;in the shelf.- At its inner portion the link has the downwardly-deflected ends c extending into and through said slot in the shelf to a point below the same and downwardly beside the supporting-slide at that side of the desk. The lower or inner end of the flat link overlaps and lies beside a flat vertically-disposed lever f, resting beside the slide and fulcrumed at its upper portion to a rigid part of the desk by a fixed pivot, such as f, so that the lever swings in a vertical plane toward and from the desk-front, and at its lower portion said lever is loosely confined or connected to said slide to reciprocate the same in or out with the swing of the lever. The inner end of the link is pivotally joined to said lever at a point below the fulcrum thereof-for instance, at a point i11- termediate the length of the lever about at the central portion thereof, but by no means necessarily so. This lever is short and preferably not greater in length than the vertical height of the slide, and its fulcrum is below the horizontal plane of the upper surface of the desk-shelf, and although we have shown the lever f ulcru med to a desk end just below the shelf, yet the fulcrum could be at the slot in the shelf and above or below the said fulcrum, as shown, and still be below the upper surface of the shelf and near the inner end of the slot.

The specific operativeconnection or relative arrangement shown between the lever and slide comprises a vertical guideway or slot (1 in the slide, usually at an intermediate point in the length thereof, and the lower end of the lever is provided with a lateral end or stud f loosely confined in said preferably straight vertical guideway, so as to work vertieally therein as the lever swings and the slide is projected thereby.

In the drawings the Hat lever and link are shown arranged between the inner face of the desk end and the fiat face of the slide, which can have a side recess or depression (about as shown) to accommodate the lever and link; but the parts can be otherwise arranged as respects the slide and desk end, and the recess in the slide is not essential.

\Vhen the lid is in its open position, each link lies flush in the seats in the lid and shelf and the lever is practically out of sight and below the plane of the top surface of the shelf. The link is straight between the pivot at its outer end and the slot in the shelf, at which point the lever extends downwardly and inwardly at an angle, to a point beside and overlapping both the slide and lever with its pivotal point to the lever in advance of the fulcrum of the lever,thereby holding up the lever which extends forwardly with a slight downward inclination, and with the stud or end f a distance above the bottom of the guideway in the slide and holding the slide projected out and beneath and upholding the lid.

\Vhen the lid is raised, the link first moves vertically throughout its length without moving inwardly, turning on its joint with the lever and lifting the lover a short distance.

Then when the joint between the link and lid reaches a certain height the link moves inwardly, thereby again swinging the lever down and rearwardly,retraciing the slide into the desk.

Vhen the lid is closed, the link is raised from the lid and shelf and extends down through the slot at an inclination, usually with its inner end over or beyond the fulcrum of the lever. The lever when the parts are in this position is swung back usuallya slight distance beyond the Vertical, as shown in Fig. 2.

Material advantages and new results are attained by employing the general arrangement shown, wherein the short lever is at its upper end fulerumed to the desk adjacent to the opening in the desk-top and usually at a point generally below the plane of the top face of the desk shelf, top, or writing-surface, in that the inner end of the link enters the opening through the desk-top and swings down through said opening as the lid is raised, whereby a short slot or opening only is necessary, avoiding the elongated slot and extensive path of movement necessary where a long lever is provided at its upper end pivoted at the top part of the desk a considerable distance above the desk-top and the link is always arranged above the desk -top .and swings back with the lever above said top, requiring a space and extra partition between the pigeon-holes or shelving of the desk and the desk ends in addition to certain other practical and commercial disadvantages.

' \Ve prefer that our levers and links should be so arranged that when the lid is lowered the pivotal point between the link and lever will be in advance of the vertical plane including the fulcrum of the upper end of the lever, although such may not be employed in all forms within the scope of our invention. It should be noted that the lever swings in a most extensive are, and hence throws the slide the proper distance in or out, and also that the free end of the lever has a throw far greater in length than the slot or opening in the desk top or shelf of the desk-bottom, said slot being short and not equal to the throw of the slide, as must be the ease in certain cumbersome devices sometimes used in the trade where a long lever is pivoted between an extra partition and a desk end and the link extends to the lever and is pivoted to the same entirely above the desk-bottom, and hence always maintains its position above the desk-top. In such disadvantageous construction the slide and lever are started backward with ajerk and jar the instant the lid starts upward, while in our construction when the lid first starts up there is a lifting inovementof the link, so that the parts adjust themselves before the slide is started backward. It might also be noted that said disadvantageous constructions only employ a metal rod, while in our construction such a rod could not be advautageously employed, but by reason of the 

